Constantine I of Armenia may refer to:
- Constantine I, Prince of Armenia (1035–1040 – c. 1100), who ruled from 1095 – c. 1100
- Constantine I, King of Armenia (1278 – c. 1310), who ruled from 1298–1299
- Constantine I of Cilicia, catholicos in 1221–1267
This disambiguation page lists articles associated with the title Constantine I of Armenia.
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